Feb 262020

The United States had Grace Hopper: A diminutive, elderly lady with a stern look on her face, uncannily wearing a rear admiral’s dress uniform as the oldest active-duty commissioned officer in the United States Navy, even as she earned the nickname Grandma COBOL, for her role in the development of one of the oldest computer programming languages still in use today.

But there was another female computer scientist with a career just as defining and just as fascinating as that of Rear Admiral Hopper: Xia Peisu, sometimes known as China’s mother of computer science.

Xia Peisu in 1946

Xia Peisu in 1946

I learned about Xia Peisu just now, from a BBC News online article. What an amazing life! I am especially fascinated by Chinese scientists and engineers who never gave up, who continued to work for the benefit of their country even through the indignities of the Cultural Revolution and other political upheavals.

Dr. Xia lived a long life: she passed away in 2014, at the age of 91. She lived to see the modern, interconnected world with computers everywhere. She also lived to see computers as means of oppression and surveillance in the hands of police and totalitarian regimes, China among them. I would have loved to know what she thought of it all.

 Posted by at 11:26 pm
Feb 172020

Our most comprehensive paper yet on the Solar Gravitational Lens is now online.

This was a difficult paper to write, but I think that, in the end, it was well worth the effort.

We are still investigating the spherical Sun (the gravitational field of the real Sun deviates ever so slightly from spherical symmetry, and that can, or rather it will, have measurable effects) and we are still considering a stationary target (as opposed to a planet with changing illumination and surface features) but in this paper, we now cover the entire image formation process, including models of what a telescope sees in the SGL’s focal region, how such observations can be stitched together to form an image, and how that image compares against the inevitable noise due to the low photon count and the bright solar corona.

 Posted by at 11:37 pm
Feb 042020

Before heading to bed, I briefly turned on CNN, to listen to a few minutes of the coverage of the Iowa caucus fiasco.

In light of what I am hearing, I only have one question: Exactly when did the great United States turn into an incompetent banana republic?

Hmmm, actually, I also have a second question. Is this how the Democratic Party planning to beat Donald Trump in November?

 Posted by at 1:43 am